A bi-directional anchoring high pressure liner hanger and method of setting

Abstract

This invention discloses a bidirectional anchoring high-pressure tailpipe hanger and its mounting method, relating to the field of oil and gas cementing tool technology. It includes a hanger body, a bidirectional anchoring mechanism, and a mounting mechanism. The bidirectional anchoring mechanism is located within the hanger body and includes radially movable first and second slips, corresponding to a first and second window, respectively. The slips protruding from the windows provide anchoring support against axial tensile force and jacking force, respectively. The mounting mechanism includes a drive component, a motion conversion mechanism, and a transmission assembly. The drive component is located in a second annular cavity and responds to hydraulic drive to move along a first direction. The motion conversion mechanism converts this motion into rotational motion. The transmission assembly connects the motion conversion mechanism and the first and second slips. When the drive component moves, the motion conversion mechanism and transmission assembly drive the first and second slips to move radially outward synchronously and protrude from the window, achieving bidirectional anchoring. This invention has a simple structure, is easy to use, and can effectively adapt to complex high-pressure working conditions.

Description

Technical Field

[0001] This invention relates to the field of oil and gas cementing tools, and in particular to a bidirectional anchoring high-pressure tailpipe hanger and its mounting method. Background Technology

[0002] In the process of oil and gas exploration and development, the tailpipe hanger is a key tool for cementing the tailpipe by suspending it on the upper casing. With the development of oil and gas exploration into deeper and ultra-deep formations, as well as the development of high-pressure oil and gas reservoirs, downhole conditions are becoming increasingly complex, placing higher demands on the performance of the tailpipe hanger.

[0003] Existing tailpipe hangers, such as conventional hydraulic or mechanical hangers, have the following shortcomings when facing high-pressure working environments: the slip anchoring structure of conventional hangers is mostly unidirectional, that is, it mainly relies on the cooperation between the slip and the cone sleeve to bear the axial tension of the tailpipe. However, after cementing or in subsequent operations, the tailpipe may generate huge upward force due to temperature changes, pressure fluctuations or formation extrusion. The unidirectional anchoring structure is difficult to effectively bear this bidirectional load, and there is a risk of anchoring failure. Therefore, there is an urgent need to develop a new type of tailpipe hanger that can withstand both axial tension and upward force and adapt to high-pressure and complex working conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a bidirectional anchored high-voltage tailpipe hanger and its mounting method to solve the problems existing in the prior art. It has a simple structure, is easy to use, and effectively adapts to complex high-voltage working conditions.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a bidirectional anchoring high-pressure tailpipe hanger, comprising: a hanger body, a bidirectional anchoring mechanism, and a mounting mechanism. The hanger body has a fluid channel and includes a first annular cavity, a second annular cavity, at least one first window, at least one second window, and multiple fluid inlets. The first and second windows communicate with the first annular cavity, and the fluid inlets connect the second annular cavity to the fluid channel. The bidirectional anchoring mechanism is disposed within the hanger body and includes at least one radially movable first slip and at least one radially movable second slip. The first slip corresponds to the first window, and the second slip corresponds to the second window. The first slip protruding from the first window can withstand axial tensile forces on the hanger body. The second slip, protruding from the second window, forms an anchoring support, providing anchoring support against the axial force applied to the suspension body. The seating mechanism includes a drive component, a motion conversion mechanism, and a transmission assembly. The drive component is disposed within the second annular cavity and is capable of moving in a first direction in response to hydraulic drive. The motion conversion mechanism is connected to the drive component and converts the first-direction motion of the drive component into rotational motion. The transmission assembly is connected to the motion conversion mechanism and the first and second slips, respectively. When the drive component moves, the motion conversion mechanism and the transmission assembly drive the first and second slips to move radially outward synchronously, protruding from the first and second windows, respectively, to achieve bidirectional anchoring.

[0006] Preferably, the bidirectional anchoring mechanism further includes a first expansion cone and a second expansion cone. The first expansion cone is fixedly disposed within the first annular inner cavity and is drivenly connected to the transmission assembly, and slides in cooperation with the inner surface of the first slip, for driving the first slip to move radially outward. The second expansion cone is fixedly disposed within the first annular inner cavity and is drivenly connected to the transmission assembly, and slides in cooperation with the inner surface of the second slip, for guiding the second slip to move radially outward. The transmission assembly is capable of driving the first expansion cone and the second expansion cone to move in opposite directions.

[0007] Preferably, the motion conversion mechanism includes a first conversion component and a second conversion component. The first conversion component is fixedly connected to the driving component and has a first mating part. The second conversion component is rotatably disposed in the second annular inner cavity and fixedly connected to the transmission component. The second conversion component has a second mating part, and the first mating part and the second mating part are slidably engaged to convert the linear motion of the first conversion component into the rotational motion of the second conversion component.

[0008] Preferably, the first mating part is a slider or a roller, and the second mating part is a curved groove.

[0009] Preferably, the transmission assembly includes a slip drive ring, a first slider, and a second slider. The slip drive ring is fixedly connected to the output end of the motion conversion mechanism. The first expansion cone is provided with a first guide groove, and the second expansion cone is provided with a second guide groove. The first slider is slidably embedded in the first guide groove, and the second slider is slidably embedded in the second guide groove. When the slip drive ring rotates, it drives the first slider and the second slider to slide in the first guide groove and the second guide groove respectively, thereby driving the first expansion cone and the second expansion cone to move in directions away from each other.

[0010] Preferably, both the first guide groove and the second guide groove are arc-shaped slope grooves, and their slope directions are opposite, so as to drive the first expansion cone and the second expansion cone to move in a direction away from each other.

[0011] Preferably, the seat-hanging mechanism further includes a shielding component, which is movably disposed within the fluid channel and has a first position that closes the liquid inlet and a second position that opens the liquid inlet.

[0012] Preferably, the shielding assembly includes a receiving seat, an elastic element, and a support ring. The receiving seat is slidably disposed within the fluid channel and has a groove for accommodating and sealing the ball plug. The support ring is fixedly connected within the fluid channel. The bottom end of the elastic element is fixedly connected to the support ring, and the top end of the elastic element is fixedly connected to the receiving seat, for applying an elastic force to the receiving seat to hold it in the first position.

[0013] Preferably, the driving component is an annular piston, the outer wall of the annular piston is slidably and sealingly connected to the inner wall of the second annular cavity, and the first direction is the axial downward direction.

[0014] The present invention also provides a mounting method based on the bidirectional anchored high-pressure tailpipe suspension as described in any of the preceding claims, comprising the following steps: Step S1: After connecting the hanger to the tailpipe, lower it into the predetermined position in the well using the feeding mechanism; Step S2: Insert a ball plug into the fluid channel to form a sealing fit between the ball plug and the shielding assembly; Step S3: Inject kill fluid into the fluid channel, hydraulically drive the shielding assembly to move to the position where the inlet hole is opened, and the kill fluid enters the second annular inner cavity through the inlet hole, driving the driving component to move along the first direction; Step S4: The driving component drives the transmission assembly to rotate through the motion conversion mechanism. The transmission assembly drives the first slip and the second slip to move radially outward synchronously, protruding out of the first window and the second window respectively and abutting against the inner wall of the upper sleeve to achieve bidirectional anchoring. Step S5: Stop injecting kill fluid and confirm that the mounting is secure and reliable.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention provides a bidirectional anchoring high-pressure tailpipe hanger and its mounting method. By setting a first slip and a second slip corresponding to the first and second windows respectively, and using a motion conversion mechanism to convert the hydraulically driven linear motion into rotational motion, and then driving the two slips to move radially outward synchronously through a transmission component, bidirectional anchoring and bearing against axial tensile and axial jacking forces are achieved. This structure overcomes the load-bearing limitations of traditional unidirectional anchoring hangers, effectively preventing the tailpipe from shifting upwards or downwards under complex high-pressure conditions, and significantly improving the anchoring reliability and operational safety of the hanger.

[0016] Furthermore, the combination of hydraulic drive and mechanical transmission simplifies the hanging operation, ensuring a smooth and controllable process. The coordinated movements of all components prevent uneven load issues caused by asynchronous slips, extending the tool's lifespan. In addition, the shielding component ensures reliable sealing and automatic opening of the hydraulic inlet, guaranteeing precise and controllable hydraulic drive timing and further enhancing the overall performance of the suspension system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of the bidirectional anchored high-pressure tailpipe hanger provided by the present invention; Figure 2 for Figure 1 Sectional view at point AA; Figure 3 This is a schematic diagram of the structure of the second conversion component in the bidirectional anchored high-pressure tailpipe hanger provided by the present invention. Figure 4 A schematic diagram of the structure of the first expansion cone in the bidirectional anchored high-pressure tailpipe hanger provided by the present invention; In the figure: 1. Suspension body; 2. First slip; 3. Second slip; 4. Fluid channel; 5. First expansion cone; 6. Second expansion cone; 7. Annular piston; 8. First conversion component; 9. Second conversion component; 10. Slip drive ring; 11. First slider; 12. Second slider; 13. First guide groove; 14. Receiving seat; 15. Elastic component; 16. Support ring; 17. Curved groove. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a bidirectional anchored high-voltage tailpipe hanger and its mounting method to solve the problems existing in the prior art. It has a simple structure, is easy to use, and effectively adapts to complex high-voltage working conditions.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 This embodiment provides a bidirectional anchored high-pressure tailpipe hanger, such as Figures 1-4As shown, the device includes: a suspension body 1, a bidirectional anchoring mechanism, and a mounting mechanism. The suspension body 1 has a fluid channel 4 inside, and is provided with a first annular cavity, a second annular cavity, at least one first window, at least one second window, and multiple liquid inlets. The first and second windows communicate with the first annular cavity, and the liquid inlets connect the second annular cavity and the fluid channel 4. The bidirectional anchoring mechanism is located within the suspension body 1 and includes at least one radially movable first slip 2 and at least one radially movable second slip 3. The first slip 2 corresponds to the first window, and the second slip 3 corresponds to the second window. The first slip 2 protruding from the first window provides anchoring support against the axial tensile force on the suspension body 1, and the second slip 3 protruding from the second window provides anchoring support. The suspension mechanism provides anchoring support against axial jacking forces on the main body 1 of the hanger. It includes a drive component, a motion conversion mechanism, and a transmission assembly. The drive component is located within the second annular cavity and responds to hydraulic drive by moving in the first direction. The motion conversion mechanism is connected to the drive component to convert the first-direction motion into rotational motion. The transmission assembly is connected to the motion conversion mechanism and the first slip 2 and the second slip 3. When the drive component moves, the motion conversion mechanism and transmission assembly drive the first slip 2 and the second slip 3 to move radially outward synchronously, protruding from the first and second windows respectively, achieving bidirectional anchoring. By setting different cavities, windows, and inlet holes, a basic framework is provided for hydraulic drive and bidirectional anchoring. The bidirectional anchoring mechanism effectively anchors against axial tensile and axial jacking forces, significantly improving the stability and reliability of the tailpipe hanger under complex downhole conditions and overcoming the limitations of traditional hangers with unidirectional load-bearing. The unique drive, conversion, and transmission methods of the suspension mechanism make the suspension operation more efficient and precise, ensuring reliable bidirectional anchoring under hydraulic drive.

[0023] In a preferred embodiment, the bidirectional anchoring mechanism further includes a first expansion cone 5 and a second expansion cone 6. The first expansion cone 5 is fixedly disposed within the first annular cavity and driven by the transmission assembly, and slides against the inner surface of the first slip 2 to drive the first slip 2 to move radially outward. The second expansion cone 6 is fixedly disposed within the first annular cavity and driven by the transmission assembly, and slides against the inner surface of the second slip 3 to guide the second slip 3 to move radially outward. The transmission assembly can drive the first expansion cone 5 and the second expansion cone 6 to move in opposite directions. The arrangement of the first expansion cone 5 and the second expansion cone 6 optimizes the operation of the bidirectional anchoring mechanism. Their sliding engagement with the first slip 2 and the second slip 3 makes the radial movement of the slips smoother and more controllable. The transmission assembly driving the two expansion cones to move in opposite directions helps to more precisely control the extension action of the first slip 2 and the second slip 3, enhancing the reliability and stability of the bidirectional anchoring and ensuring that the hanger can be firmly anchored to the sleeve under loads in different directions.

[0024] In a preferred embodiment, the motion conversion mechanism includes a first conversion component 8 and a second conversion component 9. The first conversion component 8 is fixedly connected to the driving component and has a first mating part. The second conversion component 9 is rotatably disposed in the second annular inner cavity and fixedly connected to the transmission component. The second conversion component 9 has a second mating part, and the first mating part and the second mating part are in sliding engagement to convert the linear motion of the first conversion component 8 into the rotational motion of the second conversion component 9. This design cleverly realizes the conversion from linear motion to rotational motion of the driving component, providing a suitable motion form for the subsequent transmission component to drive the movement of the locking jaws and the expanding cone. This conversion method has a relatively simple structure, high reliability, and can effectively convert the linear force of hydraulic drive into rotational driving force, ensuring that all components of the seat mechanism work together to achieve efficient bidirectional anchoring operation.

[0025] In a preferred embodiment, the first mating part is a slider or roller, and the second mating part is a curved groove 17. The mating method between the slider or roller and the curved groove 17 provides good motion transmission performance. The slider or roller slides within the curved groove 17, stably converting the linear motion of the first conversion element 8 into the rotational motion of the second conversion element 9. Furthermore, the shape of the curved groove 17 can be designed according to actual needs to precisely control the speed, angle, and stroke of the rotational motion, further optimizing the motion conversion effect and improving the working accuracy and reliability of the seat mechanism.

[0026] In a preferred embodiment, the transmission assembly includes a slip drive ring 10, a first slider 11, and a second slider 12. The slip drive ring 10 is fixedly connected to the output end of the motion conversion mechanism. The first expansion cone 5 is provided with a first guide groove 13, and the second expansion cone 6 is provided with a second guide groove. The first slider 11 is slidably embedded in the first guide groove 13, and the second slider 12 is slidably embedded in the second guide groove. When the slip drive ring 10 rotates, it drives the first slider 11 and the second slider 12 to slide in the first guide groove 13 and the second guide groove respectively, thereby driving the first expansion cone 5 and the second expansion cone 6 to move in a direction away from each other. This transmission assembly design enables the rotational motion of the motion conversion mechanism to be effectively transmitted to the first expansion cone 5 and the second expansion cone 6. Through the cooperation of the slip drive ring 10, the slider, and the guide groove, precise control of the movement of the two expansion cones is achieved. The guide ensures the stability and accuracy of the slider's movement, thereby ensuring that the first expansion cone 5 and the second expansion cone 6 can reliably move in opposite directions, which in turn drives the first slip 2 and the second slip 3 to move radially outward in sync, achieving stable bidirectional anchoring.

[0027] In a preferred embodiment, both the first guide groove 13 and the second guide groove are arc-shaped ramps with opposite slope directions. This drives the first expansion cone 5 and the second expansion cone 6 to move away from each other. The arc-shaped ramp design utilizes the principle of inclined planes. When the slip drive ring 10 drives the slider to slide within the arc-shaped ramp, it can more effectively convert rotational motion into axial movement of the expansion cones. The opposite slope directions of the two arc-shaped ramps allow the first expansion cone 5 and the second expansion cone 6 to automatically move away from each other when the slip drive ring 10 rotates. This further optimizes the transmission effect, enhances the synchronization and reliability of bidirectional anchoring, and ensures that the suspension maintains a stable anchoring state under forces acting in different directions.

[0028] In a preferred embodiment, the mounting mechanism further includes a blocking component movably disposed within the fluid channel 4. The blocking component has a first position with the inlet hole closed and a second position with the inlet hole open. The setting of the blocking component is hydraulically driven, providing controllability. During the tool's entry into the well, the blocking component is in the first position with the inlet hole closed, preventing liquid from accidentally entering the second annular cavity and avoiding premature mounting, thus improving operational safety. When mounting is required, the blocking component moves to the second position with the inlet hole open, allowing liquid to enter the drive components and achieving precise mounting control.

[0029] In a preferred embodiment, the shielding assembly includes a receiving seat 14, an elastic element 15, and a support ring 16. The receiving seat 14 is slidably disposed within the fluid channel 4, and has a groove for accommodating and sealing the ball plug. The support ring 16 is fixedly connected within the fluid channel 4. The bottom end of the elastic element 15 is fixedly connected to the support ring 16, and the top end of the elastic element 15 is fixedly connected to the receiving seat 14, providing an elastic force to hold the receiving seat 14 in a first position. This specific shielding assembly structure is simple and reliable. The elastic force provided by the elastic element 15 keeps the receiving seat 14 in the first position of closing the inlet hole under normal conditions, effectively preventing liquid from entering. When the ball plug is inserted and a certain pressure is applied, the ball plug forms a seal with the groove of the receiving seat 14. The pressure overcomes the elastic force, causing the receiving seat 14 to move downward, opening the inlet hole and achieving controllable opening of the inlet hole, further enhancing the safety and controllability of the hanging operation. The elastic element 15 is preferably a spring.

[0030] In a preferred embodiment, the driving component is an annular piston 7. The outer wall of the annular piston 7 is slidably and sealingly connected to the inner wall of the second annular cavity. The first direction is axially downward. The slidably and sealingly connected annular piston 7 to the inner wall of the second annular cavity ensures the sealing and stability of the hydraulic drive. The axially downward movement direction design conforms to the common method of hydraulic drive, making it easy to drive the annular piston 7 by injecting liquid into the fluid channel 4, thereby driving the entire seat mechanism. This design makes the hydraulic drive more direct and effective, improving the working efficiency and reliability of the seat mechanism.

[0031] In a preferred embodiment, the outer periphery of the slip drive ring 10 is provided with a ratchet structure, and the inner wall of the first annular cavity is provided with ratchet teeth that cooperate with the ratchet structure. The ratchet structure and the ratchet teeth cooperate to form a one-way locking mechanism to prevent the slip drive ring 10 from rotating in the opposite direction, thereby ensuring that the first slip 2 and the second slip 3 maintain a stable radial extension state after anchoring, avoiding slip retraction due to downhole pressure fluctuations or vibrations, and further enhancing the reliability and durability of bidirectional anchoring.

[0032] Example 2 This embodiment also provides a mounting method for a bidirectional anchored high-pressure tailpipe suspension based on any of the above, including the following steps: 1. Preparation: Tool Inspection and Connection: Carefully inspect all components of the bidirectional anchored high-pressure tailpipe hanger for damage, especially key components such as the first slip 2, second slip 3, first expansion cone 5, second expansion cone 6, motion conversion mechanism, transmission assembly, and shielding assembly. Ensure the fitting accuracy of each component, such as smooth sliding fits between the first slider 11 and the first guide groove 13, the second slider 12 and the second guide groove, and the first mating part and the second mating part. Reliably connect the hanger body 1 to the tailpipe, ensuring the connection can withstand various loads during downhole operations. For example, use high-strength threaded connections and apply sealant to ensure sealing performance.

[0033] Ball plug preparation: Prepare a ball plug that matches the groove of the receiving seat 14, ensuring the dimensional accuracy and sealing performance of the ball plug to ensure a good seal with the receiving seat 14 during the mounting operation.

[0034] 2. Lowering into the well: Slow descent: Using appropriate entry tools, slowly lower the hanger connected to the tailpipe to the predetermined position inside the well. During the descent, closely monitor changes in parameters such as tension and torque at the wellhead, and adjust the descent speed in real time based on downhole pressure monitoring data. Prevent the hanger from colliding or scraping against the well wall, ensuring the hanger is safely and accurately lowered to the predetermined depth.

[0035] Real-time monitoring: Utilizing monitoring equipment at the wellhead and downhole, the status of the hanger downhole is monitored in real time, including changes in the position of each component and whether it is subjected to abnormal external forces. For example, the appearance of the hanger can be observed through downhole cameras, and downhole pressure changes can be monitored through pressure sensors to promptly detect potential problems and take appropriate measures.

[0036] 3. Seating and hanging operation: Ball plug insertion: Once the hanger reaches the predetermined well depth, insert the ball plug into the fluid channel 4 from the wellhead, ensuring the ball plug accurately falls into the groove of the receiving seat 14. A seal is formed between the ball plug and the groove to prevent liquid leakage. This step requires ensuring that the force applied when inserting the ball plug is appropriate to avoid damaging the ball plug or it not falling accurately into the groove.

[0037] Hydraulic drive: Liquid is injected into fluid channel 4. As the liquid pressure gradually increases, the pressure acts on the ball plug and the receiving seat 14. When the pressure is sufficient to overcome the elastic force of the elastic element 15, the receiving seat 14 overcomes the elastic force and slides downward, moving from the first position with the inlet hole closed to the second position with the inlet hole open. At this time, fluid channel 4 is connected to the second annular inner cavity through the inlet hole, and the injected liquid enters the second annular inner cavity, pushing the annular piston 7 to move axially downward. During this process, the pressure change of the injected liquid is closely monitored, and the pressure value when the receiving seat 14 moves is recorded as one of the bases for judging whether the seat mechanism is working properly.

[0038] Motion Conversion and Transmission: The downward movement of the annular piston 7 drives the first conversion component 8, which is fixedly connected to it, to move downward synchronously. Due to the sliding engagement between the first mating part (slider or roller) on the first conversion component 8 and the second mating part (curved groove 17) on the second conversion component 9, the linear motion of the first conversion component 8 is converted into the rotational motion of the second conversion component 9. The second conversion component 9 drives the fixedly connected slip drive ring 10 to rotate. When the slip drive ring 10 rotates, the first slider 11 and the second slider 12 connected to it slide within the first guide groove 13 of the first expansion cone 5 and the second guide groove of the second expansion cone 6, respectively. Since the first guide groove 13 and the second guide groove are arc-shaped grooves with opposite slope directions, the sliding of the first slider 11 and the second slider 12 drives the first expansion cone 5 and the second expansion cone 6 to move in directions away from each other.

[0039] Bidirectional anchoring is achieved as follows: the first expanding cone 5 and the second expanding cone 6 move away from each other, sliding and engaging with the inner surfaces of the first slip 2 and the second slip 3 respectively, thereby driving the first slip 2 and the second slip 3 to move radially outward synchronously. The first slip 2 protrudes from the first window, providing anchoring support against the axial tensile force on the hanger body 1; the second slip 3 protrudes from the second window, providing anchoring support against the axial jacking force on the hanger body 1, thus achieving bidirectional anchoring. During this process, the stability of the wellhead pressure and the images or data fed back by the downhole monitoring equipment can be observed to determine whether the first slip 2 and the second slip 3 accurately protrude from the window and make good contact with the inner wall of the casing, ensuring the reliability of bidirectional anchoring.

[0040] 4. Sealing inspection and confirmation: Pressure Stabilization Check: After the set-up is complete, stop injecting fluid and observe whether the wellhead pressure is stable. Stable wellhead pressure indicates that the set-up device is working well and there are no problems such as fluid leakage. If the pressure fluctuates or drops, it may mean that there is a problem with the set-up mechanism's sealing or other malfunctions, requiring further inspection and handling.

[0041] Anchoring Status Inspection: Using downhole ultrasonic imaging, electromagnetic flaw detection, and other inspection equipment, a detailed inspection is conducted on the fit between the first slip 2 and the second slip 3 and the inner wall of the casing. This ensures that the first slip 2 and the second slip 3 are in full contact with the inner wall of the casing and are firmly anchored, effectively withstanding axial tensile and axial jacking forces. If the inspection reveals that the slips are not tightly fitted to the inner wall of the casing or that there are local gaps, it may be necessary to adjust the hanger position appropriately or take other remedial measures to ensure the stability and reliability of the hanger downhole.

[0042] By using the above methods, the performance advantages of the bidirectional anchoring high-pressure tailpipe hanger can be fully utilized, ensuring reliable bidirectional anchoring under complex downhole conditions and providing a solid guarantee for subsequent cementing operations.

[0043] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A bi-directional anchoring high pressure liner hanger, characterized by, include: The main body of the hanger has a fluid channel inside and is provided with a first annular inner cavity, a second annular inner cavity, at least one first window, at least one second window and a plurality of liquid inlet holes. The first window and the second window are in communication with the first annular inner cavity, and the liquid inlet holes are used to connect the second annular inner cavity and the fluid channel. A bidirectional anchoring mechanism is disposed within the suspension body, comprising at least one radially movable first slip and at least one radially movable second slip. The first slip corresponds to the first window, and the second slip corresponds to the second window. The first slip protruding from the first window can provide anchoring support for the axial tensile force on the suspension body, and the second slip protruding from the second window can provide anchoring support for the axial top force on the suspension body. The seat-hanging mechanism includes a drive component, a motion conversion mechanism, and a transmission assembly. The drive component is disposed within the second annular inner cavity and is capable of moving in a first direction in response to hydraulic drive. The motion conversion mechanism is drively connected to the drive component and is used to convert the first-direction movement of the drive component into rotational movement. The transmission assembly is connected to the motion conversion mechanism and the first and second slips, respectively. When the drive component moves, the motion conversion mechanism and the transmission assembly drive the first and second slips to move radially outward synchronously, protruding from the first and second windows, respectively, to achieve bidirectional anchoring.

2. The bi-directional anchoring high-pressure liner hanger of claim 1, wherein, The bidirectional anchoring mechanism further includes a first expanding cone and a second expanding cone. The first expanding cone is fixedly disposed within the first annular inner cavity and is connected to the transmission assembly, and slides in cooperation with the inner surface of the first slip, for driving the first slip to move radially outward. The second expanding cone is fixedly disposed within the first annular inner cavity and is connected to the transmission assembly, and slides in cooperation with the inner surface of the second slip, for guiding the second slip to move radially outward. The transmission assembly can drive the first expanding cone and the second expanding cone to move in opposite directions.

3. The bi-directional anchoring high-pressure liner hanger of claim 1, wherein, The motion conversion mechanism includes a first conversion component and a second conversion component. The first conversion component is fixedly connected to the driving component and has a first mating part. The second conversion component is rotatably disposed in the second annular inner cavity and fixedly connected to the transmission component. The second conversion component has a second mating part, and the first mating part and the second mating part are slidably engaged to convert the linear motion of the first conversion component into the rotational motion of the second conversion component.

4. The bi-directional anchoring high-pressure liner hanger of claim 3, wherein, The first mating part is a slider or a roller, and the second mating part is a curved groove.

5. The bi-directional anchoring high-pressure liner hanger of claim 1, wherein, The transmission assembly includes a slip drive ring, a first slider, and a second slider. The slip drive ring is fixedly connected to the output end of the motion conversion mechanism. The first expansion cone is provided with a first guide groove, and the second expansion cone is provided with a second guide groove. The first slider is slidably embedded in the first guide groove, and the second slider is slidably embedded in the second guide groove. When the slip drive ring rotates, it drives the first slider and the second slider to slide in the first guide groove and the second guide groove respectively, thereby driving the first expansion cone and the second expansion cone to move in a direction away from each other.

6. The bi-directional anchoring high-pressure liner hanger of claim 5, wherein, Both the first guide groove and the second guide groove are arc-shaped slope grooves, and their slope directions are opposite, so as to drive the first expansion cone and the second expansion cone to move in a direction away from each other.

7. The bi-directional anchoring high-pressure liner hanger of claim 1, wherein, The mounting mechanism also includes a shielding component, which is movably disposed within the fluid channel and has a first position that closes the liquid inlet and a second position that opens the liquid inlet.

8. The bidirectional anchored high-pressure tailpipe hanger according to claim 7, characterized in that, The shielding assembly includes a receiving seat, an elastic element, and a support ring. The receiving seat is slidably disposed within the fluid channel and has a groove for accommodating and sealing the ball plug. The support ring is fixedly connected within the fluid channel. The bottom end of the elastic element is fixedly connected to the support ring, and the top end of the elastic element is fixedly connected to the receiving seat, for applying an elastic force to the receiving seat to keep it in the first position.

9. The bi-directional anchoring high-pressure liner hanger of claim 1, wherein, The driving component is an annular piston, and the outer wall of the annular piston is slidably and sealingly connected to the inner wall of the second annular cavity. The first direction is the axial downward direction.

10. A method of setting a bidirectional anchoring high-pressure liner hanger according to any one of claims 1-9, characterized in that, Includes the following steps: Step S1: After connecting the hanger to the tailpipe, lower it into the predetermined position in the well using the feeding mechanism; Step S2: Insert a ball plug into the fluid channel to form a sealing fit between the ball plug and the shielding assembly; Step S3: Inject kill fluid into the fluid channel, hydraulically drive the shielding assembly to move to the position where the inlet hole is opened, and the kill fluid enters the second annular inner cavity through the inlet hole, driving the driving component to move along the first direction; Step S4: The driving component drives the transmission assembly to rotate through the motion conversion mechanism. The transmission assembly drives the first slip and the second slip to move radially outward synchronously, protruding out of the first window and the second window respectively and abutting against the inner wall of the upper sleeve to achieve bidirectional anchoring. Step S5: Stop injecting kill fluid and confirm that the mounting is secure and reliable.

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